PLATE V. 



Fig. 11. Cross section of portion of a leaf, showing- resin gland. X 500. 

 t, Epidermis, showing cuticle; u, resin gland; v, photosynthetic cells; w, 

 water-storage cells; x, xylem of a vascular bundle. 



I^IG. 12. Tangential section of leaf, showing cross section of resin 

 gland. X 500. y, Water-storage cells; z, photosynthetic cells; a, resin 

 gland. 



Fig. 13. Tangential section through the tip of the tooth on the 

 margin of the leaf, x 500. b, Resin glands; c, tracheids; d, water-stor- 

 age cells; e, tracheids; /, water-storage cells. 



Fig. 14. Cross section through the tip of a tooth on the margin of 

 the leaf. X 300. g, Resin glands; h, water-storage cells; i, tracheids; ;', 

 photosynthetic cells. 



Fig. 15. Composite drawing of bleached leaf, x 500. A - , Epidermal 

 cells; /, veins; m, stoma; n, water-storage cells. 



Fig. 16. Epidermis of leaf. X 500. o, Stoma; p, epidermis; q, photo- 

 synthetic cells. 



Fig. 17. Photosynthetic cells. X 500. t, Nucleus; s, chloroplasts. 



Fig. 18. Epidermis of leaf. X 500. n, Epidermal cell; u, stoma; w, 

 guard cell. 



Fig. 19. Epidermis of leaf, x 500. x, Epidermis; y, guard cell; a, 

 cuticle on inner wall of guard cell. 



Fig. 20. Tracheids from leaf. X 500. b, Spiral tracheids; c, pitted 

 tracheids; d, tracheids with elongated pits. 



